JPS62288315A - Combustion chamber structure of direct injection type internal combustion engine - Google Patents
Combustion chamber structure of direct injection type internal combustion engineInfo
- Publication number
- JPS62288315A JPS62288315A JP12907986A JP12907986A JPS62288315A JP S62288315 A JPS62288315 A JP S62288315A JP 12907986 A JP12907986 A JP 12907986A JP 12907986 A JP12907986 A JP 12907986A JP S62288315 A JPS62288315 A JP S62288315A
- Authority
- JP
- Japan
- Prior art keywords
- combustion chamber
- main
- communication hole
- fuel
- sub
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 93
- 238000002347 injection Methods 0.000 title claims abstract description 28
- 239000007924 injection Substances 0.000 title claims abstract description 28
- 239000000446 fuel Substances 0.000 claims abstract description 27
- 238000004891 communication Methods 0.000 claims abstract description 24
- 239000003595 mist Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 11
- 239000007921 spray Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/12—Other methods of operation
- F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
３、発明の詳細な脱刷
［産業上の利用分野］
本発明はピストン頂部に主燃焼室と副燃焼室とを−＆ｉ
連通して形成した、だるま形の燃焼室を有する直噴式内
燃機関において、Ｗｊ１燃焼室から主燃焼室への火炎伝
播性を高めた直噴式内燃ｎ閏の燃焼室構造に関する。Detailed Description of the Invention 3. Detailed Printing of the Invention [Field of Industrial Application] The present invention provides a main combustion chamber and a sub-combustion chamber at the top of the piston.
The present invention relates to a combustion chamber structure of a direct injection internal combustion engine that has a pot-shaped combustion chamber formed in communication with each other, in which flame propagation from the Wj1 combustion chamber to the main combustion chamber is improved.
［従来の技＃ｉ］
従来、第６図ないし第７図に示すように、ピストン１の
頂部に主燃焼室２と副燃焼室３とを並設し、これらをバ
ンク部４の上部およびバンク部４に形成した連通孔６に
より連通した、だるま形の燃焼室（特願昭６０−２７８
８７９号）を有する内燃機関が提案されている。[Conventional Technique #i] Conventionally, as shown in FIG. 6 and FIG. A pot-shaped combustion chamber (patent application 1986-278) communicates with the communication hole 6 formed in the part 4
No. 879) has been proposed.
内燃機関がアイドル・軽負荷時には噴射ノズル５の副噴
口から副燃焼室３に副噴霧ｆのみが噴射され、燃焼は副
燃焼室３でａｎ合状態にて行なわれる。一方、中・高負
荷時にはｎ１噴ｎｆだけでなく噴射ノズル５の主噴口か
らの主唱ＩＦが主燃焼室２に噴射される。この場合、副
燃焼室３での燃焼による火炎すは連通孔６を通って主燃
焼室２に伝えられる。When the internal combustion engine is idling and under a light load, only the sub-spray f is injected from the sub-nozzle of the injection nozzle 5 into the sub-combustion chamber 3, and combustion takes place in the sub-combustion chamber 3 in an an-combination state. On the other hand, at medium or high loads, not only the n1 injection nf but also the main IF from the main injection port of the injection nozzle 5 is injected into the main combustion chamber 2. In this case, the flame caused by combustion in the auxiliary combustion chamber 3 is transmitted to the main combustion chamber 2 through the communication hole 6.
し発明が解決しようとする問題点〕
ｎ１懲焼室３からの火炎すは連通孔６を通って主燃焼！
２側に導入されるが、噴射ノズル５の主唱口から噴射さ
れた主唱ａＦによるリッチな可燃混合気ｍが図示の如く
主燃焼室２の連通孔６付近に形成されていないと、火炎
すが可燃混合気ｌに伝播されず失火し、主燃焼室２にお
いて燃焼がなされない。このため、未燃燃料が排気され
ると共に、機関出力が低下してしまう。Problems to be Solved by the Invention] The flame from the n1 incineration chamber 3 passes through the communication hole 6 for main combustion!
However, if the rich combustible mixture m caused by the main fuel aF injected from the main combustion port of the injection nozzle 5 is not formed near the communication hole 6 of the main combustion chamber 2 as shown in the figure, the flame will be The mixture is not propagated to the combustible mixture 1 and misfires, and no combustion occurs in the main combustion chamber 2. As a result, unburned fuel is exhausted and the engine output is reduced.
［問題点を解決するための手段］
上記の目的を達成するために、本発明はピストン頂部に
主燃焼室と副燃焼室とこれらをその上部で連通しつつ区
画するバンク部を形成すると共にバンク部に火炎伝播用
の連通孔を形成し、燃料噴射ノズルのｎ１噴口を副燃焼
室に臨ませ旦つ主噴口を主燃焼ヱのスワール方向と連通
孔付近とに臨ませたものである。[Means for Solving the Problems] In order to achieve the above object, the present invention forms a bank part at the top of the piston that partitions the main combustion chamber and the auxiliary combustion chamber while communicating with each other at the upper part thereof. A communication hole for flame propagation is formed in the part, and the n1 nozzle of the fuel injection nozzle faces the sub-combustion chamber, and the main nozzle faces the swirl direction of the main combustion and the vicinity of the communication hole.
［作 用］
連通孔の主燃焼室の出口部付近に燃料が噴射され可燃混
合気が形成されるので、副燃焼室から連通孔を介して主
燃焼室に導入された火炎は、連通孔の出口部付近の可燃
混合気を通じて主燃焼室のスワール方向に噴射された燃
料によって形成される可燃混合気に６「実に伝播される
。[Function] Since fuel is injected near the outlet of the main combustion chamber of the communication hole and a flammable mixture is formed, the flame introduced from the auxiliary combustion chamber to the main combustion chamber via the communication hole is The combustible mixture formed by the fuel injected in the swirl direction of the main combustion chamber is transmitted through the combustible mixture near the outlet.
［実施例１ 以下に本発明の実施例を図面に基づいて詳述する。[Example 1 Embodiments of the present invention will be described in detail below based on the drawings.
第１図ないし第２図に示ずように、ビス［・ン１の旧都
には、主燃焼室２と副燃焼室３が形成されている。主燃
焼室２、副燃焼室３ともに球形状をなし上部にはリップ
部７が形成されている。副燃焼室３の寸法は主燃焼室２
の寸法よりも小さい。As shown in FIGS. 1 and 2, a main combustion chamber 2 and a sub-combustion chamber 3 are formed in the former city of Bis[-N 1. Both the main combustion chamber 2 and the sub-combustion chamber 3 have a spherical shape, and a lip portion 7 is formed at the top. The dimensions of the auxiliary combustion chamber 3 are the same as the main combustion chamber 2.
smaller than the dimensions of
主燃焼室２と５９１燃焼卒３との間には両燃焼室を区画
するバンク部４が形成されている。バンク部４の上面は
ピストン１のＬ面よりも低く、バンク部４の上部にて主
・副燃焼室２．３は連通している。A bank portion 4 is formed between the main combustion chamber 2 and the 591 combustion chamber 3 to partition both combustion chambers. The upper surface of the bank portion 4 is lower than the L surface of the piston 1, and the main and auxiliary combustion chambers 2.3 communicate with each other at the upper portion of the bank portion 4.
また、バンク部４には副燃焼室３の火炎を主燃焼室２に
導入するための連通孔６が形成されている。連通孔６は
副燃焼室３の底部から主燃焼室２の底部に向かって下方
に傾斜し且つ主燃焼室２のスワールＳの方向に向けて形
成されている。Furthermore, a communication hole 6 is formed in the bank portion 4 for introducing the flame of the sub-combustion chamber 3 into the main combustion chamber 2. The communication hole 6 is formed to be inclined downward from the bottom of the sub-combustion chamber 3 toward the bottom of the main combustion chamber 2 and to face the direction of the swirl S of the main combustion chamber 2 .
バンク部４の上方には燃料噴射ノズル８が段りられてい
る。また副燃焼室３にはスパークプラグ９が配設されて
いる。燃料噴射ノズル８は第３図に示すように、サック
付のピント−ノズルである。A fuel injection nozzle 8 is stepped above the bank portion 4. Further, a spark plug 9 is disposed in the sub-combustion chamber 3. The fuel injection nozzle 8 is a pinto nozzle with a sack, as shown in FIG.
１０はニードル弁であり、ノズル本体のスロットル部１
１とシート部１２との間にｕ１噴口１３が、またサック
部１４には二つの主噴口１５．１６が形成されている。10 is a needle valve, and the throttle part 1 of the nozzle body
A u1 nozzle 13 is formed between the main nozzle 1 and the seat portion 12, and two main nozzles 15 and 16 are formed in the sack portion 14.
副噴口１３は副燃焼室３の内壁面に臨まけ且つ副燃焼室
３のスワールＳの流れ方向に臨ませて形成されている。The sub-nozzle port 13 is formed facing the inner wall surface of the sub-combustion chamber 3 and facing the flow direction of the swirl S of the sub-combustion chamber 3.
また、一つの主唱口１５は主燃焼室２の内壁面に臨ませ
且つ主燃焼室２のスワールＳの流れ方向に向けて形成さ
れている。また、もう一つの主噴口１６は連通孔６の主
燃焼室２側の出口部付近に且つスワールＳと同方向に向
けて形成されている。Further, one main singing port 15 is formed facing the inner wall surface of the main combustion chamber 2 and facing the flow direction of the swirl S of the main combustion chamber 2. Further, another main injection port 16 is formed near the outlet of the communication hole 6 on the main combustion chamber 2 side and facing in the same direction as the swirl S.
内燃機関のアイドル・軽負荷時（燃料のｌｒ１射聞が少
ない時）には、燃料噴射ノズル８のニードル弁１０はシ
ート部１２より離れるがスロットル部１１はほぼ閉塞状
態に保たれるので、副噴口１３からのみ燃料（副噴’Ｆ
ｌｆ）が噴射される。副燃焼室３内は濃ｄ７合状態とさ
れ、スパークプラグ９の点火により副燃焼室３では良好
な燃焼が行なわれる。When the internal combustion engine is idling or under light load (when there are few fuel injections), the needle valve 10 of the fuel injection nozzle 8 is separated from the seat part 12, but the throttle part 11 is kept almost closed, so the secondary Fuel only from the nozzle 13 (sub-injection 'F
lf) is injected. The inside of the sub-combustion chamber 3 is brought into a rich d7 state, and good combustion is carried out in the sub-combustion chamber 3 by the ignition of the spark plug 9.
一方、機関の中・高負荷時にはニードル弁１０はスロッ
トルリフトを越えるため、副噴口１３から副噴霧「が噴
射されるだけでなく、これより遅れて主噴口１５．１６
カラ主ｔｆｌｌＦｘ 、 Ｆ２ カＵＲ射される。副燃
焼室３では第４図ないし第５図に示すように、スパーク
プラグ９の放電により火種Ｋが作られ、これより火炎わ
が副燃焼室３内を伝播し、連通孔６を通じて主燃焼ｖ２
に伝えられることになる。本実施例では連通孔６の主燃
焼室２の出口部付近に主唱ｎ Ｆ ２が噴射されリッチ
な可燃混合気ｍが形成され、この可燃混合気ｍによって
スワールＳ方向に流れる主唱７８ Ｆ ｔによる可燃混
合気ｍとの確実な接続が図れ連続した火炎伝播路が形成
されるので、主燃焼室２では安定し■つ急速な燃焼がな
される。従って、未燃燃料の発生が防止されると共に、
機関出力が向上する。On the other hand, when the engine is under medium or high load, the needle valve 10 exceeds the throttle lift, so not only is the secondary spray injected from the secondary nozzle 13, but also the secondary spray is injected later from the main nozzle 15.16.
Color main tfllFx, F2 color UR is fired. In the auxiliary combustion chamber 3, as shown in FIGS. 4 and 5, a spark K is created by the discharge of the spark plug 9, from which the flame propagates inside the auxiliary combustion chamber 3, and through the communication hole 6, the main combustion V2 is generated.
will be communicated to. In this embodiment, the main fuel n F 2 is injected near the outlet of the main combustion chamber 2 of the communication hole 6 to form a rich combustible mixture m, and this combustible mixture m causes the main fuel 78 F t to flow in the direction of the swirl S. Since a reliable connection with the combustible mixture m is established and a continuous flame propagation path is formed, stable and rapid combustion occurs in the main combustion chamber 2. Therefore, the generation of unburned fuel is prevented, and
Engine output increases.
なお、上記実施例の燃料噴射ノズル８はピン１−一タイ
ブの６のであったが、機関負荷にかかわらず、主・ｎ１
燃焼室に同時に燃料を噴霧する通常のホールタイプの燃
料噴射ノズルを用いた直噴式内燃機関にも本発明を適用
することができる。Although the fuel injection nozzle 8 in the above embodiment was a pin 1-1 type 6, regardless of the engine load, the main/n1
The present invention can also be applied to a direct injection internal combustion engine using a normal Hall type fuel injection nozzle that simultaneously sprays fuel into the combustion chamber.
また燃料としては、軽油だし”ノでなく、ガソリン、ア
ルコールにも適用Ｃきる。In addition, the fuel used is not only diesel oil, but also gasoline and alcohol.
［発明の効果］
以上要するに本発明によれば、主・副燃焼室を連通ずる
火炎伝播用の連通孔の主燃焼掌側の出口部付近に燃料を
噴射して濃混合気状態としているため、副燃焼室から主
燃焼室への火炎の伝播が確実になされ、主・副燃焼室で
の急速で完全な燃焼が得られ、未燃燃料の発生を防止し
、胤関出力を向上できる等の優れた効果を発揮すること
ができる。[Effects of the Invention] In summary, according to the present invention, fuel is injected near the outlet on the main combustion palm side of the communication hole for flame propagation that communicates the main and auxiliary combustion chambers, so that a rich mixture is created. The flame propagation from the auxiliary combustion chamber to the main combustion chamber is ensured, rapid and complete combustion is achieved in the main and auxiliary combustion chambers, the generation of unburned fuel is prevented, and fuel output can be improved. It can exhibit excellent effects.
第１図は本発明に係る燃焼室部の一実施例を示す平面図
、第２図は同燃焼室部の測高面図、第３図は第１図の燃
料噴射ノズルの縦断面図、第４図、第５図は第１図の燃
焼室部における燃焼状態を説明するための図、第６図、
第７図は従来の燃焼室部における燃焼状態を説明するた
めの図である。
図中、１はピストン、２は主燃焼室、３は副燃焼室、４
はバンク部、５は燃料噴射ノズル、６は連通孔、７はリ
ップ部、８は燃料噴射ノズル、９はスパークプラグ、１
０はニードル弁、１１はスロットル部、１２はシート部
、１３は副噴口、１４は１１ツク部、１５．１６は主唱
１コ、ｂは火炎、ｋ Ｌｔ火種、ｆハｎＪｊｉＩ露、Ｆ
、 Ｆ ｒ 、 Ｆ ２ ハ主１ｆＨ’ｌｉ、ｍは可
燃混合気である。
特許出願人 いすず自動車株式会社
代理人弁理士 絹 谷 信 雄
第２図
第３図
第４図
第５図FIG. 1 is a plan view showing an embodiment of the combustion chamber according to the present invention, FIG. 2 is a elevational view of the combustion chamber, and FIG. 3 is a vertical sectional view of the fuel injection nozzle shown in FIG. 1. 4 and 5 are diagrams for explaining the combustion state in the combustion chamber section of FIG. 1, and FIG.
FIG. 7 is a diagram for explaining the combustion state in a conventional combustion chamber. In the figure, 1 is the piston, 2 is the main combustion chamber, 3 is the sub-combustion chamber, 4
is a bank part, 5 is a fuel injection nozzle, 6 is a communication hole, 7 is a lip part, 8 is a fuel injection nozzle, 9 is a spark plug, 1
0 is the needle valve, 11 is the throttle part, 12 is the seat part, 13 is the sub-nozzle, 14 is the 11-piece part, 15.16 is the main 1 piece, b is the flame, k Lt type of fire, f HanJjiI dew, F
, F r , F 2 C main 1fH'li, m is a combustible mixture. Patent Applicant: Isuzu Motors Co., Ltd. Representative Patent Attorney Nobuo Kinutani Figure 2 Figure 3 Figure 4 Figure 5
Claims (2)
の上部で連通しつつ区画するバンク部を形成すると共に
バンク部に火炎伝播用の連通孔を形成し、燃料噴射ノズ
ルの副噴口を副燃焼室に臨ませ且つ主噴口を主燃焼室の
スワール方向と連通孔付近とに臨ませたことを特徴とす
る直噴式内燃機関の燃焼室構造。(1) A bank part is formed at the top of the piston to communicate and separate the main combustion chamber and the sub-combustion chamber at the top, and a communication hole for flame propagation is formed in the bank part, and the sub-nozzle of the fuel injection nozzle is connected to the bank part. A combustion chamber structure for a direct injection internal combustion engine, characterized in that the main injection port faces the auxiliary combustion chamber and the main injection port faces the swirl direction of the main combustion chamber and the vicinity of the communication hole.
上記連通孔が副燃焼室から主燃焼室に向かって下方に傾
斜して形成された特許請求の範囲第１項記載の直噴式内
燃機関の燃焼室構造。(2) the auxiliary combustion chamber is formed shallower than the main combustion chamber;
A combustion chamber structure for a direct injection internal combustion engine according to claim 1, wherein the communication hole is formed to be inclined downward from the sub-combustion chamber toward the main combustion chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12907986A JPS62288315A (en) | 1986-06-05 | 1986-06-05 | Combustion chamber structure of direct injection type internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12907986A JPS62288315A (en) | 1986-06-05 | 1986-06-05 | Combustion chamber structure of direct injection type internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62288315A true JPS62288315A (en) | 1987-12-15 |
| JPH0467563B2 JPH0467563B2 (en) | 1992-10-28 |
Family
ID=15000557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12907986A Granted JPS62288315A (en) | 1986-06-05 | 1986-06-05 | Combustion chamber structure of direct injection type internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62288315A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0879944A3 (en) * | 1997-05-21 | 1999-07-14 | Nissan Motor Company, Limited | Cylinder direct injection spark-ignition engine |
-
1986
- 1986-06-05 JP JP12907986A patent/JPS62288315A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0879944A3 (en) * | 1997-05-21 | 1999-07-14 | Nissan Motor Company, Limited | Cylinder direct injection spark-ignition engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0467563B2 (en) | 1992-10-28 |
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